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Old 11-26-2012, 06:37 AM   #1
American Coach Owners Club
Spartan Chassis
Join Date: Nov 2012
Posts: 66
Onan 8KW Issue

Good Morning,
I have an Onan 8KW diesel generator that is shutting down under load with a Code 25. Before I run to Cummins, I thought I would get some input from the group. I am wondering if a fuel delivery issue would generate that code? Last year I replaced the fuel lines, and did a complete service in October. I would like to do some more troubleshooting or even do the repair myself before I make a service appointment. Seeing the fuel lines are relatively new and new filters have been installed, do I have a faulty fuel pump?? I am hoping that a member or members have experienced this issue with resolution.
Thank you.

Fred '01 Country Coach Magna

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Old 11-26-2012, 06:42 AM   #2
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Code 25 is related to the governor. Unless you have been into one before I suggest you get it to a Onan Tech

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Old 11-26-2012, 06:43 AM   #3
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Onan Generators - SmokStak
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Old 11-26-2012, 04:34 PM   #4
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Location: Silver Springs, FL. USA
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A Code 25 indicates excessive speed, so I don't see how a fuel supply problem could cause that. Low speed maybe, not not high. I think you have a governor problem.
Gary Brinck
Former owner of 2004 American Tradition
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC
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Old 11-27-2012, 04:42 AM   #5
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Workhorse Chassis Owner
Join Date: Aug 2010
Posts: 39
Onan Model Number

What is the model number of your generator? This is what is available online for a 8000 Onan Generator , Fault 25.


Govener unable to regulate to target speed.
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